CDCM1804RTHT Equivalent & Substitute Parts

Part Overview

The CDCM1804RTHT is a clock fanout buffer (distribution) IC manufactured by Texas Instruments, designed for 1:4 clock distribution at frequencies up to 800 MHz. This device accepts multiple input signal types (CML, HSTL, LVDS, LVPECL, LVTTL, SSTL-2, VML) and outputs LVCMOS or LVPECL signals in a 24-VFQFN surface mount package.

The CDCM1804RTHT is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and field replacement applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	CDCM1804RTHT
Manufacturer	Texas Instruments
Category	Clock/Timing
Type	Fanout Buffer (Distribution), Divider, Multiplexer
Number of Circuits	1
Ratio - Input:Output	1:4
Differential - Input:Output	Yes/Yes
Input Signal Types	CML, HSTL, LVDS, LVPECL, LVTTL, SSTL-2, VML
Output Signal Types	LVCMOS, LVPECL
Frequency - Max	800 MHz
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	24-VFQFN Exposed Pad
Supplier Device Package	24-VQFN (4x4)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the CDCM1804RTHT is determined by the following critical parameters:

Primary Substitution Criteria:

Identical input:output ratio (1:4)
Identical maximum frequency (800 MHz)
Identical supply voltage range (3V ~ 3.6V)
Identical operating temperature range (-40°C ~ 85°C)
Identical package type (24-VFQFN Exposed Pad)
Compatible input and output signal types

Substitute Parts Identified:

CDCM1804RGER meets all primary substitution criteria. This part is electrically and mechanically identical to the CDCM1804RTHT, with the distinction that CDCM1804RGER maintains Active product status.

CDCM1804RGET shares the same base product number and package but differs in the input:output ratio (1:3 instead of 1:4). This part is not a direct functional equivalent and is listed as a parametric alternative only.

Parameter Comparison

Parameter	CDCM1804RTHT	CDCM1804RGER	CDCM1804RGET
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Type	Fanout Buffer (Distribution), Divider, Multiplexer	Fanout Buffer (Distribution), Divider, Multiplexer	Fanout Buffer (Distribution), Divider, Multiplexer
Number of Circuits	1	1	1
Ratio - Input:Output	1:4	1:4	1:3
Differential - Input:Output	Yes/Yes	Yes/Yes	Yes/Yes
Input Signal Types	CML, HSTL, LVDS, LVPECL, LVTTL, SSTL-2, VML	CML, HSTL, LVDS, LVPECL, LVTTL, SSTL-2, VML	CML, HSTL, LVDS, LVPECL, LVTTL, SSTL-2, VML
Output Signal Types	LVCMOS, LVPECL	LVCMOS, LVPECL	LVCMOS, LVPECL
Frequency - Max	800 MHz	800 MHz	800 MHz
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad
Supplier Device Package	24-VQFN (4x4)	24-VQFN (4x4)	24-VQFN (4x4)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	2 (1 Year)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

CDCM1804RGER is the primary substitute for CDCM1804RTHT. Both parts are electrically and mechanically identical with matching electrical specifications, package dimensions, and signal compatibility. The CDCM1804RGER maintains Active product status, ensuring ongoing availability and manufacturing support. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

CDCM1804RGET is a parametric alternative only. While it shares the same base product number, package type, and most electrical characteristics, the 1:3 input:output ratio differs from the 1:4 ratio of the CDCM1804RTHT. This part is suitable only for applications requiring three output channels instead of four. CDCM1804RGET is also Active status and maintains identical compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can CDCM1804RGER be used as a direct replacement for CDCM1804RTHT?

A: Yes. CDCM1804RGER is electrically and mechanically identical to CDCM1804RTHT. Both parts feature 1:4 clock distribution, 800 MHz maximum frequency, identical supply voltage (3V ~ 3.6V), matching operating temperature range (-40°C ~ 85°C), and the same 24-VFQFN package. The primary advantage of CDCM1804RGER is its Active product status.

Q: What is the difference between CDCM1804RGET and CDCM1804RTHT?

A: The CDCM1804RGET has a 1:3 input:output ratio, whereas CDCM1804RTHT has a 1:4 ratio. This means CDCM1804RGET provides three output channels instead of four. All other electrical parameters, frequency specifications, supply voltage, and package type remain identical. CDCM1804RGET is not a direct functional equivalent.

Q: Are all three parts pin-compatible?

A: CDCM1804RGER and CDCM1804RTHT are pin-compatible. CDCM1804RGET shares the same 24-VFQFN package but has different internal functionality due to the 1:3 ratio configuration. Pin compatibility does not guarantee functional equivalence.

Q: What compliance certifications apply to these parts?

A: All three parts (CDCM1804RTHT, CDCM1804RGER, and CDCM1804RGET) are ROHS3 compliant and REACH unaffected. All parts have Moisture Sensitivity Level 2 with a 1-year shelf life requirement.

Q: Why is CDCM1804RTHT classified as obsolete?

A: CDCM1804RTHT is listed as obsolete by Texas Instruments. CDCM1804RGER, with identical specifications and Active status, is the recommended alternative for new designs and ongoing production.

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